Portable vacuum cleaner



FIG. 1 is a right side elevational view of a portable vacuum cleaner embodying the new design, the left side being a mirror image of the right side;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a portable vacuum cleaner, as shown and described. 